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; SYNOPSIS:
; # clisp gcd.lisp 11 22 33 121
; # ecl --shell gcd.lisp 121 22 33
; # gcl -f gcd.lisp 121 22 33
; # sbcl --script gcd.lisp 121 22 33
(defun gcd2 (a b)
(loop while (/= b 0) do
(psetq a b b (mod a b))
finally (return a)))
(defun gcdn (n &rest ns)
(reduce #'gcd2 ns :initial-value n))
(defun program-args ()
(or
#+CLISP *args*
#+ECL (ext:command-args)
#+GCL si::*command-args*
#+SBCL *posix-argv*
nil))
(defun numbers ()
(remove nil
(map 'list (lambda (x) (parse-integer x :junk-allowed t))
(program-args))))
(let ((ns (numbers)))
(when ns
(write (apply #'gcdn ns))
(fresh-line)))
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